International experts have contributed key chapters to this major work on groundwater contamination. Section 1: Methodology and Modeling deals with both organic and inorganic contaminants, including those from agricultural operations. Section 2: Case Studies presents contamination scenarios with both inorganic and organic chemicals including agriculturally-related constituents, such as the nitrates. This important new publication is a welcome addition to the literature and will enhance recent information on methodology, modeling and real-world situations. It is of interest to scientists and planners in local and national government; environmental chemists, geochemists, geologists, and health and safety officers; river authorities; hydrologists; and the mining and land reclamation industries.SECTION 1 METHODOLOGY AND MODELING Hydrogeochemical modeling to predict subsurface transport, Dave A. McIntosh Transport of reactive solute in soil and groundwater, Sjoerd E.A.T.M. van der Zee Modeling of diffuse-source nitrate transport beneath grazed leguminous pastures, Peter J. Dillon and William E. Kelly Modeling point sources of groundwater contamination: a review and case study, G. B. Davis and R. B. Salama Representative sampling of groundwater from boreholes, C. Barber and G. B. Davis Modeling N and P loads on surface and groundwater due to land use, C. F. Hopstaken and E. F. W. Ruijgh Interactive modeling of groundwater contamination: visualization and intelligent user interfaces, Kurt Fedra, Hans J?rg Diersch and Frank Harig Modeling contaminant transport and biodegradation in groundwater, Hanadi S. Rifai and Philip B. Bedient In situ detection of contaminant plumes in groundwater by remote spectroscopy, W. Rudolf Seitz SECTION 2 CASE STUDIES Nitrates in groundwater in the southeastern USA, R. K. Hubbard and J. M. Sheridan Residual soil nitrate after application of nitrogen fertilizerlCZ